* Android is an open-source operating system for mobile devices developed by Google. Since its release in 2007, it has become the most widely used mobile operating system in the world. Android is based on a modified version of the Linux kernel and other open-source software, and it allows users to customize their devices and install a wide variety of applications.
* Android is developed by Google, but it is open-source, which means that anyone can modify and distribute it. This has led to the creation of many different versions of Android, known as custom ROMs. These ROMs can add new features and customization options to Android devices.